Final answer:
The nurse should use aseptic technique, which involves pouring the liquid into a sterile container within the sterile field to maintain sterility and prevent contamination.
Step-by-step explanation:
The nurse uses aseptic technique to moisturize gauze in a sterile field. This technique involves pouring the liquid into a sterile container within the sterile field, as outlined in option A. This method helps maintain sterility and prevents contamination. By holding bottles at an angle and possibly passing them through a flame, the risk of airborne contaminants entering the solution is minimized. Also, using tools like pre-sterilized pipettes ensures controlled and accurate transfer of sterile solutions. The ultimate goal is to maintain a sterile environment to prevent sepsis and other infections during medical procedures.